643165216663159 has 2 divisors, whose sum is σ = 643165216663160. Its totient is φ = 643165216663158.

The previous prime is 643165216663141. The next prime is 643165216663213. The reversal of 643165216663159 is 951366612561346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643165216663159 - 2²³ = 643165208274551 is a prime.

It is a super-2 number, since 2×643165216663159² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643165216663159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643165216663129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321582608331579 + 321582608331580.

It is an arithmetic number, because the mean of its divisors is an integer number (321582608331580).

Almost surely, 2^{643165216663159} is an apocalyptic number.

643165216663159 is a deficient number, since it is larger than the sum of its proper divisors (1).

643165216663159 is an equidigital number, since it uses as much as digits as its factorization.

643165216663159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125971200, while the sum is 64.

The spelling of 643165216663159 in words is "six hundred forty-three trillion, one hundred sixty-five billion, two hundred sixteen million, six hundred sixty-three thousand, one hundred fifty-nine".